Lift axle control on axle 1. Lift axle control on axle 3

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1 Commercial Vehicle Systems Product DATA Function On vehicle combinations using semi-trailers it is often difficult to meet the turning corridor required by European Community (EC) legislation. When certain lift axle configurations are fitted and activated, meeting the corridor requirement becomes impossible. In addition the wear on the tyres of semi-trailers can be a major contributor to running costs. is a function within Knorr-Bremse s TEBS G braking systems which interfaces with the trailer s air suspension system to enable the negotiation of tighter curves without hitting the kerbs and to minimise tyre wear. Operation TEBS G Doc. No. Y (EN - Rev. 00) June 0 Doc. No. Y (EN - Rev. 00) June 0 without with PD--F0 is a function of Knorr-Bremse s TEBS G braking systems which interfaces with the trailer s air suspension system and intelligently manages the pressure in the air bags of an axle to temporarily reduce the load carried by that axle. continuously monitors the input from the wheel speed sensors and can tell when the vehicle is entering a tight curve or corner by the difference between the sensor signals. is activated by a % difference in wheel speed signals. also monitors the air suspension pressure to establish the axle/bogie loading. Taking an example of a -axle semi-trailer with and lift axle control on axle, it responds by lowering the lift axle at the front of the bogie. This reduces the effective wheelbase of the trailer thereby reducing the turning circle of the combination. Note: it is possible that the brakes on the trailer could be applied during operation and to avoid any tyre damage configured for minimum turning circle Lift axle control on axle Lift axle control on axle axle lowered by axle raised by under these conditions Knorr-Bremse recommends that the service brakes on the lift axle are controlled via a TEPM-S or TEPM-P. This requires S/M operation and is suitable only for use with Premium brake modules. Irrespective of the loading on the trailer, the lowering and raising of lift axles is controlled by such that the loading on axles does not exceed the programmed maximum load. The default setting for automatically disabling is 00%. If this load figure has been reduced during Set Up then will adjust the load accordingly. It is possible to define values from 90% upwards. Note: When the vehicle exceeds 0km/h (or the programmed limit) then the target load (load on the non controlled axles) will return to 00%, e.g. if 0% was the target load during operation above 0 km/h this will reduce to 00%, or if 90% was the target load during operation above 0 km/h this will increase to 00%. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

2 PD--F0 TEBS G Product Data Doc. No. Y (EN - Rev. 00) June 0 When is configured for minimum tyre wear, using the example of a -axle semi-trailer, it will raise and lower the lift axles (as loading permits) in order to minimise tyre wear through: firstly minimising the number of axles carrying load (reducing tyre scrub ) controlling the geometry of the axles carrying load to minimise tyre wear Note: The function is best applied to front lift axles for minimising tyre wear. When detects from the wheel speed sensor signals that the vehicle has straightened up sufficiently, its operation ceases and the axle controlled by is treated as a normal lift axle under the control of the automatic lift axle control logic. configured for minimum tyre wear Lift axle control on axle Lift axle control on axle axle raised by axle raised by The function is deactivated during ABS and RSP operation and by certain other braking, traction and suspension commands. The priority of relative to other functions is shown below: Priority Function Description Highest Auxiliary Design Language (ADL) An ADL program may override any calculated lift axle state. Activation of a ISO 99 or J99 CAN commands A command such as Raise or Lower a lift axle will disable all lower priority functions. function Driver request Driver request via a connected manual switch will input such as Traction Help. override ISO 99 CAN ATC status ATC Active will cause an automatic Traction any action Help request. requested by a An command will override any icargo function or Automatic Lift Axle Control command. with a lower priority icargo Automatic Lift Axle Control (LAC) An icargo command will override any Automatic Lift Axle Control command. If no other request is active then the Automatic Lift Axle Control will take control of the lift Lowest axle(s). Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

3 Commercial Vehicle Systems Doc. No. Y (EN - Rev. 00) June 0 TEBS G PD--F0 Set Up Setting up of is carried out using the Knorr Bremse ECUtalk diagnostic software. ECUtalk version...0 or higher is required. This can be downloaded from BremseCVS.com in the Download Software section. Use the Knorr-Bremse diagnostic program ECUtalk to configure the lift axles as required (see PD--F0, Document No. Y8). TEBS G.0, G. and G. Standard up to CN0 The parameters are set under the AUXIO tab. Set the required control parameters. The Load [%] setting controls the degree of load that can be experienced on the other (non-controlled) axle(s). The default is set to 00% but it may also be possible to program different values (from 90% upwards). There is a drop-down list which controls the configuration of : for minimum turning circle or for minimum tyre wear Select which is the preferred option. can be automatically disabled above a set speed (this is the speed as used for Traction Help (TH) and Manouevring Help (MH)). Click on Next and complete the normal set up of the TEBS software. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

4 PD--F0 TEBS G Product Data Doc. No. Y (EN - Rev. 00) June 0 TEBS G. Standard (CN00 and above), Standard Plus and Premium The configuration of the function is carried out using the ECUtalk software. Use the Change configuration option under the Auxiliary I/O tab. Set up the lift axle under the relevant tab then select the TH / MH option and enable. There is a drop-down list which controls the configuration of : or for minimum turning circle for minimum tyre wear Select which is the preferred option. Click on Next and complete the normal set up of the TEBS software. Note: Note: Ensure that the recommendations of the axle manufacturer are observed with regard to overload. It is the vehicle manufacturer s responsibility to ensure that the air suspension system is capable of supplying sufficient air pressure and volume to the air bags of the axles not raised or off-loaded during operation to ensure that the required axle load is carried by those axles. Note: will only operate when the wheel speed sensors have been automatically calibrated once after first set in operation (by driving the vehicle above 0 km/h and at a steady speed for at least minutes without any significant bends). Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

5 Commercial Vehicle Systems Doc. No. Y (EN - Rev. 00) June 0 TEBS G PD--F0 System Requirements Components required with : Part No. In the range K0900 to K0909* or K090 to K099* OR K090 to K099* or K090 to K099* Type No. ES00 Description Brake Module (TBM) TEBS G.0 Premium or TEBS G. Premium [Software version 00. or higher] Brake Module (TBM) TEBS G.0 Standard or TEBS G. Standard [ Flashed to CN0] OR K0 to K0* ES090 TEBS G. Standard or Standard Plus Brake Module (TBM) OR K0* ES09 TEBS G. Premium Brake Module (TBM) K08* - V Solenoid or K0* - pneumatic or K0988* - V Solenoid AE Lift Axle Control Valve Recommended option: K090* OR K0900* for S/M operation with Premium Brake Modules ES00 ES0 See PD--0, Document No. Y8 for suitable cables * alternatives depending on vehicle design specification Trailer Electro-Pneumatic Module (TEPM) TEPM-S TEPM-P [Software version 00. or higher] may be fitted on trailers with lift axle control (LAC) (see PD--F0, Document No. Y8) and icargo (see PD--F0, Document No. Y). Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

6 PD--F0 TEBS G Product Data Doc. No. Y (EN - Rev. 00) June 0 Installation is a function of the TEBS G braking systems and requires the fitment of a suitable TEBS Brake Module (TBM) plus suitable Lift Axle Controls (LAC) as normally fitted to trailers - see System Requirements. The TBM should be installed as specified in the PD--00, Document No. Y00. - typical recommended installation (with TEPM) - electrically controlled LAC TEBS G Premium Brake Module (TBM) Trailer Electro-Pneumatic Module Standard (TEPM-S) Lift Axle Control (LAC) Valve Levelling Valve 00bw Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

7 Commercial Vehicle Systems Doc. No. Y (EN - Rev. 00) June 0 TEBS G PD--F0 Typical Wiring Diagram - TEBS G. Premium with electrically signalled LAC and TEPM-S Trailer Electro-Pneumatic Module Standard (TEPM-S) ISO 8 A B SP/RtR S-A Aux Power S-B RD /GN / LAC () () () () () () () () RD /GN / V_VALVE V_ECU GND_H GND_M WL V-CAN-H V-CAN-L AUX IO AUX IO AUX IO SENS_Sup / TriState SENS_In / TriState SENS_GND Brake-Light V Brake-Light GND V-CAN-L V-CAN-H AUX IO - RET AUX IO - RET S-D In-Out S-F S-C S-E Power B TEBS G. - ECU TEBS-G-0_ems_c Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

8 PD--F0 TEBS G Product Data Doc. No. Y (EN - Rev. 00) June 0 Typical Wiring Diagram - TEBS G. Premium with electrically signalled LAC and TEPM-S ISO 8 ISO 098 RD /GN / Trailer Electro-Pneumatic Module Standard (TEPM-S) A B S-A Aux Power S-B Junction Box LAC () () () () () () () () RD /GN / AUX IO AUX IO - RET AUX IO AUX IO - RET V-BRAKE CAN-L V-BRAKE CAN-H SENS_Sup SENS_GND AUX IO AUX IO - RET SENS_In n/c V_VALVE V_ECU GND_H GND_M WL V-CAN-H V-CAN-L AUX IO AUX IO AUX IO SENS_GND In-Out. In-Out. In-Out. In-Out Power SENS_In / TriState SENS_Sup / TriState Brake-Light V Brake-Light GND V-CAN-L V-CAN-H AUX IO - RET AUX IO - RET S-E S-F C D C D S-C S-D A TEBS G. Premium - ECU TEBS-G.Prem_TEPM-S_ Revision Details Rev. 00 September 0 ECUtalk screenshot on page brought up to date. Rev. 00 September 0 ECUtalk screenshots for TEBS G. Standard CN00 and above are the same as G. Standard Plus and Premium Rev. 00 June 0 Correction - notes added on pages and. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax: